Electrical testing system.



H. P. CLAUSEN. ELECTRICAL TESTING SYSTEM.

APPLICATION man FEB. n. 1911.

1,263,377. Patented Apr, 23, 191s.v

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H?! CLAUSEN;

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APPLICATEOE FILED FEB. 17. I911- mgmea Aim 23, was.

H. P. CLAUSEN.

ELECTRICAL TESTING SYSTEM.

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ELEC'E'RICAL TESTING SYSTEM. APPLlC Tl0N' HLED. FEB. l7. I917- I IPatented Apr, 23,- l9l&

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H. P. CLAUSEN ELECTRICAL TESTING f'YSTEM. APPLICATION nLzo 'rEa. n.1911.

1,263,377o v v Patent/ed Apr. 23. 1918.

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ma 2. cneusnn, or MOUNT VERNON, new YORK; assienoaro wns'rnan nrincrsrci moonronarnn. or new roan, it. 332, a conronarron or new roan.

nincrrticaia sesame srs'raia.

To aZ-Z whom it may concern:

Be it known that I, HENRY P. CLAUsEN,

vacitizen of the United. States, residing at Mount Vernon, in the countyof Westchesand State of New York, have invented certain new and usefulImprovements in Electrical Testing Systems, of which the following is afull, clear, concise, and exact description.

This inventio'h relates to electrical testing systems for use-intelephone exchange systems, and has for its object the provision ofmeans for automatically making routine tests of various parts ortelephone systems.

In telephone exchange systems where automatic switches areused it isimportant that frequent tests of the'apparatus be made.

to determine whether or not such apparatus 15 in a standardor anunstandard condit on.

heretofore there have been devised circuits and apparatus for makingspecific which such tests are made, hence the use of separate circuitsfor making each routine test 15 impractical for it results in adupl1cat1on of testing wires and apparatus, and makes the cost of thesystem prohibitive from a commercial standpoint.

The present invention contemplates a master testing device in whichvarious tests are performed by a composite structure either singly orotherwise.

Specifically the invention resides in a switching device whichsuccessively brings a plurality of brushes into association with sets offixed contacts, each of which sets is connected to certain importanttesting points in the apparatus to be tested. A number of testingcircuits are connected to the brushes and an auxiliary switching devicecauses the successive functioning of each test circuit. After thecompletion of the full series of tests, the brushes are auto:

matically moved forward into association with the next set of terminals.The successive movement of the brushes is continuousin both the forwardand reverse dlIGCtlOIlS,

and thus the apparatus connected to each set of terminals isperiodically sub ected. .to a

with o o a. so A. feature of the invention is the provisionSpecification of Letters Patent. Patqgnfiedi A m, 23 391%, Applicationfiled. February 1?, 1817. $erial Ito. 149,238.

of means forcausing this device to perform 7 all of the tests for whichit is arrangedin succession or only one of such tests. In the lattercase the means for advancing the brushes is removed from the control ofthe auxiliary switching device and placed. directly under the control ofthe onetesting circuit which is to function.

The following testing operations are a few of those which may heperformed by such a master testing device:

1 Determining whether line switch or selector switch frames are groundedor crossed with battery.

2. Determining theoperative condition of line switches and makingmarginal tests on the same.

3. Testing certain conductors for opens.

4. Testing for accuracy of adjustment and general operation. I

5 Testing telephone lines for insulation resistance. 7

6. Determining message registers.

7. Making peg counts of incoming and outgoing trafic. i

operative condition of 8. Locating receiver oil the hook and plac- No.1,232,498, granted to H. P. ClauSemJuly 10, 1917. The principle theredisclosed may with equal facility be applied to line.

switches and line finder switches for making tests to determine theoperative condition of the same.

Testing conductors for opens has been disclosed in one phase in PatentNo..1,220,607, granted to H. P. Clausen, March 27, 1917. In another ofits phases it will bedisclosed in the present application. The vfourthof the abovementioned tests has been 'fully described in Patent No.1,246,548, granted to H. P, Clausen, November 13, 1917. i

The test for insulation resistance of a line is described in Patent No.1,232,498, before tioned. t

A method of and apparatus for determining the operative condition ofmessage regis-- ters is disclosed in the present invention.

A method of and apparatus for making a peg count of trafiic cond1tionsis the basis of Patent No. 1,251,475, granted to H. P. I Glaus'en,January 1', 1918.

A description of the method of and apparatus for locating a receiverofi' the hook and for placing a howler upon the line forms the basis forPatent No. 1,224,140, granted to H. P. Clausen, May 1, 1917.

Y spirit of the invention.

In the drawings Figure 1 is a plan view; Fig. 2 is a side elevation, andFig. 3 is a front elevation of the structural details of a step-by-stepswitch which is suitable for use in the present invention; Fig. 4 is aside view of a registering devlce which may be employed in connectionwith the step-bystep switch; Fig. 5 is a front view of the same; Fig. 6is a bottom view showing'in detail the marking member; Fig. 7 is. adetail view of part of the mechanism for actuating the markingmechanism; Fig. 8 is a top view of the same; Fig. 9 is a diagrammaticrepresentation of an automatic connectozswitch showing the manner inwhich ten important testing points are connected to the terminals of thetesting device of the present invention; Fig. 10 shows a specificcircuit for testing for open trunk circuits and shows in detail thatpart of Fig. 9 which is indicated by the rectangle designated TC Fig. 11shows in detail a circuit for the'stepping magnet of the step-by-stepswitch; Fig. 12 is a diagrammatic representation of a well-known type ofline switch showing the manner in which ten important testing points areconnected to the terminals of the master testing device of the presentinvention. The part below the lower broken line represents a circuit bymeans of which the message register within the line switch is tested;and Fig. 13 is a diagrammatic representation of means by which themaster testing device may be caused to perform a I number of separatetests on a piece of apparatus in sequence or a certain one of suchseparate tests.

General description of master testing device.

Lesser.

device consists of a frame F upon which is slidably mounted a carriageconsisting of a bed plate B and the various piecesof apparatus to behereinafter described. Secured,

to the frame F is a bracket 1 upon which in" turn are mounted theterminals 23 to t suitably insulated from each otherloy the strips ofinsulation I. Brushes b to b are mounted upon the bed plate B and are soarranged that each forward step of the bed plate B will bring a set ofbrushes into operative relation with the next set of terminals. .Se-

curedto the frame F is a bent metal piece,

designatedas F upon which are mounted the two magnets 8M and 551W. Thesemagnets have a common armature A, one end of which is pivotally attachedto the frame F and the other end pivotally secured to one end of a rackR. The other end of the rack R is pivotally secured to a member 2 of thesame length as the armature A and secured and SM but are not strongenough to prevent such magnets fromv attractin their armature A. Theyserve when such magnets are deenergized to return the rack R- to itsnormal position.

The rack R is provided with a series of teeth with which one or theother extremities of the pawl P cooperates. In the .position shown, andfor the reason to be explained later, the bed plate B and the apparatusmounted thereon is in its extreme lefthand position and the brushes 5 to5 are mature A to the right and through the agency of the pawl P the bedplate 15 is moved one step to the right so that the brushes 6 to b arebrought into engagement with the second set of terminals 5 to 6 Upon thedeenergization of magnet SM? the force of the. spring 3 exerted on thepin 5 returns the rack R to its normal position land the left-handextremity of the pawl P drops into the second tooth of the rack R.

The pawl is pivotally attached to the bed plate B and held in theposition shown, through the agency of a springs which is secured at oneend to the pawl P, at the other end to the sliding member 6, and pivotedin its central portion to a member 7 secured to the had plate stridingLeeann? member '6 is loosely riveted to the under side of the bed plateBand provided with two slots 8 in such a manner that pressure exerted onits left-hand extremity will cause it to move to the right in. relationto the bed plate B or pressure exerted on its righthand extremity willcause it to move to the left in relation to the bed plate B.

Under successive energizations ofmagnet 5M the brushes 6 to b are causedto traverse in turn each set of terminals 6 to t and when the last isreached the member 6 makes physical contact with the contact spring'9,which moving a very small dis tance makes physical and electricalcontact with the non-resilient stop member 10 through which a circuit isclosed and through which the member 6 is also caused i to move-towardthe left. The result of the making of an electrical contact between themembers 9 and 10, as will be explained later, is to cause the magnet SM?to be energized thereafter in place oi the magnet SM? Spring member 11is securely attached to the bed plate B and cobperates with the slidingmember 6 through two notches 12 y in such a manner that this member issecurely held in its transferred. position against the slight pressureof the spring S until again transferred through physical contact withthe members 9 and 10. lhe

movement of the member 6, as described,

now causes the spring S to exert its pressure in the opposite directionso that the pawl P-is oppositely inclined and its righthan'dextremitynow engages the teeth of the rackR.

Mounted on the bed plate B is one form of recording magnet RM. Thearmature A of this magnet actuates member 13 which descends upon a chart14: on the platen 15 for a purpose to be hereinafter des ribed. Attachedto one end of the armature A is an insulated piece 3.6 which actuatesthe contact members 17 38 for a purpose also to be hereinafterdescribed.

The circuit for operating this master test ing device is shown in 11. Animpulse arising from a connection to ground and the conductor 19,travels over this conductor through the contact 20, the winding oimagnet 5M to battery and ground, whereupon the magnet SM attracts itsarmature A and moves the rack R and the brushes 6 to therethrough intoassociation with the next set of terminals 25 to 25 When the brusheshave completed their full travel the member 6, as explained, makesphysical contact with the members 9 and 10 and at the same timeestablishes an electrical contact, which closes a circuit from ground,through members 10 and 9, the magnet M to battery,- and thence toground. -The magnet M attracts its armature A which is thereafter heldin its new position through the spring S until later moved in a similarmans ner by the magnet M The movement oi? armature A causes thetransferoi the cenductor 19 from connection over the contact 20' totlie'contact 21 and throughthewinding of magnet SM tobattery and ground,

so that impulses arising later upon the corn ductor 19 cause themovement in the cppo site direction ofthe rack R.

' ,Deta'iled operation of recorder.

Figs. 4 to 8 inclusive represent the preferred form of the recordingmechanim controlled by magnet this form is shown separately from thefirst three figures for the sake of clearness.

A frame F may be attached to the bed- "Ill member 26, provided withraised mnnerals I 2, 3, etc, and points to one or another of thesenumerals. The circuit arrangements suchv that as the sequence switchspoken of moves from position i position2 the magnet and causes the handto moveirom a position Wl it points to 1 to a position where it pointsto 2, and so on. A pawl 2? is provided to the teeth of the ratchet wheel23 and hold it in its actuated. position against the force of the coiledspring S until restoration takes place.

The magnet 3M is provided with an armature A to which is attached amember 28 bent up and formed into a book which extends over the pawl 22in such a manner that upon the actuation of armature A the pawl 22 willbe forced out-oi engagement with the teeth of the ratchetW-heel 23. Theother end of the member 28 is bent up and around in a fashion to controlthe no I pawl 27, which it also forces out of engage-' ment with theteeth of ratchet wheel 23 when the armature A is actuated.

The extremity of the armature, A? engages asuitable notch on the member29 pivoted to a collar 30 secured to the shaft 24-. As the armature Adescends and thereby carries the apparatus which is secured to the shaft24, the member 29 comes:

into engagement with the pin 31 and is thereby thrown out of engagementwith the armature A. Through the upward thrust of the spring 8 which itwill be noted has U. S. Patent 1,127,808 is used.

a double function in this apparatus, the stamping member 25 andassociated member 26 will return to their normal positions. It should benoted that the member 26 is held in fixed relationship to the frame F 26are returned to their normal position, they are pressed firmly against aplaten and thereby leave an impression on a chart which indicatestheposition of the associated sequence switch when the recording operationtook place.

Whenthe shaft 24 returns to normal the ratchet wheel 23'is freed fromthe pawl 27 which is held down in the position shown in Fig. 5. Underthe influence of the spring S the member 25 returns to its normalposition, and when the armature 23 is released the pawl 27 in ascendingagain comes into association with the teeth of the ratchet wheel 23through an enlarged tooth 33 out especially in the normal position forthe purpose of allowing such reengagement.

It should be noted at this point that a latch 34 is provided tocooperate with a projection 35 of the pawl 22 so that when the pawl 2:2,under the influence of the armature A is moved downward, this latchengages the pawl and holds it down until the ratchet wheel 23 hasresumed its normal position. At this time a stop member 36 engages a pin37 of the latchEA and thereby disengages the latch from the pawl 22.

It should also be noted that the collar 30 is loosely mounted on theshaft 24: so that when the'shaft 24 rotates the collar 30 remainsstationary, being held in this position by a member 38 associatedtherewith.

Description of control circuit of master tester.

In the beforementioned patents, certain circuits useful in testing forunstandard conditions in telephone apparatus have been described. Itwill be noticed that in each a sequence switch of a type described inThis sequence switch comprises a motor magnet through which a spindlecarrving a number of contactors is rotated. These contactors areillustrated in the present drawings as 51 and 52 in Fig. 13. in suchcases the contacts are adapted to be closed only in such positions ofthe sequence switch as are indicated by the numerals placed beside thecontact points. Each sequence switch is provided with a contact such asA. which is adapted to be opened only in the positions indicated by thenumerals adiacent to the contact points. Each testing ascent"? device isalso provided with a hand switch 65 such as lit in Fig, 10, and a magnetSM- which is adapted in a certain position of the associated sequenceswitch to move the brushes of the testing device forward.

The master testing device is one in which all routine tests forunstandard conditions on a certain piece of apparatus may be made.

In Fig. 9, ten important testing points in a in order that the mastertester may perform first one and then the others in succession,

the circuit illustrated in Fig. 13 is'provided. The hand switch H of theseparate testing circuit is replaced by the contacts of a relay such as60, 70, 80, etc. The conductor, connected in each case to the steppingmagnet Sll/Lis replaced by a conductor leading from sequence switchcontacts 61, 71,81, etc, to a sequence switch contact 53, and insteadofcausing the brushes 6 to b to be advanced to the next set of terminalsthe closure of the contacts 61, 71, 81, etc., causes the master sequenceswitch 50-to advance the test from that made by the circuitin- 'dicatedat T6 to that made by the circuit indicated at T i The operation is asfollows:

The hand switches H and H are actuated. H being thrown into engagementwith its first contact. A. circuit is then established from ground, thesequence switch contact 51 (positionl), the winding of rela 60, tobattery, and ground. The relay 60 1s energized and, attracting itsarmatures,

functions ,in the same manner as the handswitch 8 or" Fig. 10, whichwill hereinafterbe described, or the hand switch H of several of thebeforementioned copending patent applications. The testincircuit'supervised by the relay 60 then per orms its duties theassociated sequence switch 62 having successively passed through itsseveral positions, and the test being completed, arrive in what willhere be styled position 18, that being the position just before normal.A circuit is thereupon established from ground,

the sequence switch contact 61 osition 18;,

the sequence switch contact 53 position 1 winding of sequence swith 50through the hand switch- H to battery and ground. The sequence switch 50moves its contact/ore into position .2. wh ten-pen a circuit isestablished from groun the sequence switch contact 52fpositiou 2,sequence switch contact-(o3 (position 18), the winding of se- 5 uucuces\\:itch '(i2, to battery and ground.

The sequence switch 62 moves into its nor- .uniifposit-ion. The movementolt'sequence switch from position 1 to position 2 causes the dci nergiofrelay and the cnergization of 2 icy to through a circuit which extendsand, sequence switch contact 51. 2}, the windin of relay 70, to 'udground. The testing circuit by relay 70 now performs its .miiar mannerto that described epon the completion of this test established fromground, set-ch contact '2 1 osit1on.18), secontact 53 position 2), themagnet of sequence switch to battery and ground. I he sequence swrtcnmoves its contactors Wu position 2 to position 3, whereupon the I it) isdet ncrgized and the sequence .n niored into its normal position, therciay energized.

11 this manner ti on the separate tests vinp; circuits, such he separateT t/ TU, TC and TC, are made in succession and upon the completion ofthe iast, ciicuit is established. from ground to i switch cont-act 5 1(positions), switch H the winding of stepping wgnet QM to battery, andground. Step- SE1? causes the movement of s t to in the manner hercinbe-It should. be noted that the o tact 5% is ciosed depends on the numberof testing circuits which the master sequence switch 50 controls. Siould it be desired to cause the energization of the stepping magnet SMafter the as first test made by the testing; circuit such as T43 iscompietcd, the hand switch H is set on the second of these contacts andthe hand switch H is thrown to its oft-norinal position. The groundprojected in this case over the conductor leading from the sequenceswitch contact 61, instead of cansing the movement of the sequenceswitch 50, causes the energization of magnet SM over acircuit extending;from ground, sequence switch contact 61 (position 18),-sec- 'ond contactofhand switch H through the conducto member of hand switch IF, thewinding of stepping magnet SM, to battery and ground. In such a casethesequence switch 50 must be left in position 1 so that "the relay 60will be continually energized.

The separate test supervised by the relay 70 may be made by stopping thesequence switch 50 in position 2, opsnmg the hand switch H and placingthe hand'switch H on the third of its contacts whereby the control ofthe magnet SM is had by the sequence switch 72 over itscontact 71.

.lrmny cmcn of separate testing circuits wztlzzn the master zesfcr.

Referring now especially to Figs. 9 and .10 and espcciallv to that partof Fig. 9 below the broken line, the brushes I) to b inclusive arearranged in operative relation to the sets of terminals 25 totrespectively. The apparatus represented by the rectangles TC to TCinclusive is connected to the brushes 7) to t) inclusive, each onerepresenting a separate testing circuit such, for instance, as thatshown in Fig. 10. Fig. 10, in tact, is represented by the first of theserectangles TC and it will be seen, there fore, that by the aid of thecircuit and a paratus diagranunatically represented in ig. 10 a test onthe selector switch diagrammatically represented in the part of Fig. 9above the broken line may be made through the conductors connected tothe terminals 5, t and 1:

The rectangle TC represents the circuit described in the hetorcmentionedPatent No. 1,251,250, which application discloses means for testing theframe. of telephone apparatus for crosses with battery or ground.

The testing circuit represented by the rectangle TC may be thatdescribed in the beforementioned Patent No. 1,224,140.

The testing circuit represented by the rectangle TC" may be thatdescribed in the be- :toremeutioued Patent No. 1,216,548.

The testing circuit represented by the rectangle'TC may be thatdescribed in the bettorementioncd Patent No. 1,251,47 5.

The testing circuit represented by the rectangle TC may be for someother testing circuit to perform some other routine test and may beconnected to the brushes 1) to Z2 in anyinanner desired.

Decca 32507; of cirmtit for testing) tr'u/nks for openings.

Referring to Figs. 9 and 10in conjunction, it will be assumed that thebrushes I),

- 2) and 15 are resting on the terminals t, t

and t connected to the selective switch'shown in the upper part of Fig.9. The hand switch H is thrown to its actuated position and therebyestablishes a. circuit ground, the lef hand member of hand switch H,through the interrupter I, the motor magnet of sequence switch 90, tobattery, and ground. Under the influence of the constantly movinginterrupter I the sequence switch moves its contactors successivelythrough their different positions. In the first position a circuit isestablished from ground, battery, right-hand member of hand from pnsl

cause iurther test man A sures sun-d s13 ni, the trunk leading to S m anumiandard (1011- trunk, as herenductors in condltmn,

'z-aner ization a sequence is would 110 11nd, 21 6), win thence' 0Y9?quainca veg 1 1s My 1% z: the seuuema v if the Se pzu'fi 0: h

K? q. .L', 101: we smusnc':

the

The action 115 x a m the pre- 0v m; of re a a1 contact fiance the Windinand moi-n3. hand Wind.

s0 dit zwnca switch 125 gnence switch un m9, Sequence :1 H16Establishment ions 1 3 0 contact 61 would be closed in (he "1 posltlon.

H posit sequence swifch in a g: at of r a is he we? shes 51 211-0111teasers fi'om the seventh until a normal position is reached.

Description of circuit for tcstz'n r message registers.

in order to illustrate the application of the master testing device tovarious pieces of telephone apparatus it has been shown in Fig. 12 how amessage register in a wellknown type of line switch can be tested.

The terminals '6 to Z inclusive are connected to ten importanttestingpoints' in a line switch, the first three being used for the testof the message register. Cooperating with the first three terminals arethe brushes 22 f) and 5 In this test a hand switch H similar to the handswitch 11 of Fig. 10 is actuated and 'a circuit is established inposition 1 of the sequence switch 110, which extends from ground throughthe winding of relay 116, se-' quence switch cont-act 111 (position 1),hrush F2 terminal thence to a point where the circuit divides, extendingin one direction through the coil 117 of the message register, to groundand in the other direction to the outer armature of relay 118. 11 theline switch is busy then the contact of. this armature. will be closedin the well-known.

manner, and the circuit will then extend in this direction to batteryand ground. In this case, the relay 116 will be energized and willestablish a circuit from ground, annature and contact of relay 116, thewinding of relay 119, sequence switch contact 114: (position 1) theright-hand member of hand switch H to battery and ground. Relay 119 willbe energized in this circuit and will establish an alternate circuit foritself ex" tending from ground, armature and contact of relay 1'19,winding of relay 119, and thence over the circuit previously traced tobattery. [it the same time a circuit 1s estabfished from ground,left-hand member of hand switch H the impedance coil 120, the winding ofrelay 121, the impedance coil. 122, the right-hand member of hand switch11, to battery, and ground.

Relay 119 will now remain energized until position a is reached in whichposition the stepping magnet 8M Wlll be energized over a circuitextending from ground, batter ,tlie winding of relay 8M the sequenceswitch contact 115 (position 4) the left-hand meniber of hand switch H,to ground, and iii the well-known manner will cause the advance of thebrushes b 5" and h 11, on the other hand, the line switch is not busythis relay 116 will not he energized, and when the sequence switch movesits contactors into the second position a circuit will be establishedfrom ground, the lefthand member of hand switch 11*, the hope-- dancecoil 120,. the contact and left-hand tive relation to said contacts,like circuits armature of relay 119, the sequence switch the sequenceswitch contact 113 (position 2),

the impedance coil 122, the right-hand member of hand switch H tobattery and ground. The magnet 123 is energized in this circuit but doesnot attract its armature on account of the opposed influence of the 7magnet 11?, which is included this time-in a circuit extending fromground, winding oil]. magnet 11.2, terminal brush 13 sequence switchcontact 111, (position 2), to battery and ground. lVhen position 3 isreached the arrangement of the sequence switch contacts 112 and 113 issuch that the current flowing through the winding of coil 123 isreversed, whereupon the influence of magnet 123 is added to that ofmagnet 117, and the arms ture of the message register is actuated.Thereupon, the winding of relay 121 is short-circuited over a ,Jathleading from one terminal of relay 121, sequence switch contact 112(position. 3), the brush 2')", terminal 5'", the armature and contact ofthe message register consisting of the two magnets 117 and 123, theterminal the brush ("fsequence switch contact'113 (position 3), the

lcft-hand armature and contact of relay 119, to the other terminal ofthe relay 121. The relay 121 is thereupon deenergized and estahlishes acircuit from ground, armature and contact of relay 121, winding ofrecording magnet RMfi sequence switch contact 11 1 (position 8), theright-hand member of hand switch H to battery, and ground. The recordingmagnet 3M is energized in this circuit and attracting its armature makesrecord on the proper portion 01: the

niessageregister on the chart C, at the time it establishes a circuitfrom ground, contact and armature of recording magnet Ell 1*, winding ofrelay 119, and thence over the circuit previously "traced to battery.When nosition 4. is reached the stepping magnet energized to advance thebrushes 5 6 and 5 into association with. next set of terminals.

it should be noted that in this case the iunctioning of the recordingmagnet is opposits to that had in previously mentioned cases. This isdue-to certain traliic requirements, since it is necessary to have adefinite record of any tests made on message regis tering devices. Thefailure of the message register to attract its armature would, 1'? fore,be indicated by the absence, her than the presence, of a record upon thechart G which, for the purpose of illustration, isv satisfactory.

What is claimed is:-

1. In an electrical testing system, sets of fixed contacts, brushesarranged in opera are for detecting unsisndsrd eosditiens sennested assei. brushe means included is each of said testing circuits responsiveto e eiee'ilricsl condition indicating an unstsndsrd eetudisien a weekssm for eteeien e3 an ufssesmdemi by yerpensiv. successively easily in .1said. testing emtive and is: making 01133 ese e325 (,gzerstive 23nd mess successively @1101 automatically m? brushes int-e association withterminals 3. In an electrical testing; system, e? fixed terminals, likecircuits eenneetec' thereto, brushes in opersti reissien said ferminsis, a plurality 0f is 3301' detecting an aindsr'." s eireuits esptee, said b:rwshes eluded. in 01 *esting a sponsive is s ehsmctelf$31021 indies meehani sm unsmm for detecting unstesc psratus cemleet r:L ewes fes jenmve e ".1 1 -v n es; eendmezz ueiioimg (3-51011, a r meniJs shesete, an eperetive relatien to is deteeting s eppess'tus can.

,. eenition in said apperssus, means ntlz mg; s piece of ssxd apparatusin said last means being undelcontrol of severe difitereni; usstsndardeoniitions in said apparatus, means for causing said testing means 510test for 0111;? (me unsmndard condition its apparatus, end. means fersutomeiiefg? suecessiveiy moving said termifierent 11s means z=espal..sive tes ehsraeteristie electrics1 eondltmnen smdtermmeis denet'lng anans-tandem 001166. j: 3

me deteeiien 0f an um mess u in e ssession, mg; M 150 test 01. sei ae-rem elfierent 1m F 63. eefsdi'tions, 2116i means for suesnd tale asecrletien with ss-iai terminals. ice testing syssem, sets of mshes mtravel J L 'ietcmins's,

1 71011 in ssi. apparatus,

temetieafiy meving said s comma-ted r causing acs identifying theparticular unstandard contesting means being controlled by means re-.

sponsive to changed electrical COIldltiOIISOH said terminals denotingunstandard conditions in said apparatus, and means for successively,repeatedly and automaticall bringing said brushes into association withsaid terminals.

9. In an electrical testing system, sets of fixed terminals,electrically connected apparatus connected thereto, brushes arranged inoperative relation to said terminals, testing means connected to saidbrushes for detecting and recording several different unstandardconditions in said apparatus, said testing -means being controlled bymeans included therein responsive to changed electrical fixed terminalselectrically connected appara-tus connected thereto, brushes arranged.in operative relation to said terminals, testing means connected to saidbrushes, means controlled by said testing means for recording anunstandard condition detected by said testing means, and means forsuccessively and automatically moving said brushes into association Withsaid sets of terminals, said last means being also constructed andarranged to automatically and periodically bring said brushes intoassociation With said sets of terminals. 7

In Witness whereof, I hereunto subscribe my name this 16th dayofFebruary, A. D. 1917.

HENRY P. CLAUSEN.

